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| hp 15-ay167sa (la-d707p rev:1) no 3.3v/5v ld03/ld05 https://vlab.su/viewtopic.php?f=53&t=86155 |
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| scobay [ 05 фев 2019, 04:21 ] | |
| Заголовок сообщения: | hp 15-ay167sa (la-d707p rev:1) no 3.3v/5v ld03/ld05 |
Вложение: RT8243A pic.jpg Hi can anyone tell me the values of these resistors marked in the picture please I am gettin 19v on pin 11 and 4.7v on pin 12(enldo). Its RT8243A.No 3.3v/5v LDO voltages Many thanks |
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| armagon [ 05 фев 2019, 08:17 ] | |
| Заголовок сообщения: | Re: hp 15-ay167sa (la-d707p rev:1) no 3.3v/5v ld03/ld05 |
from a similar scheme: |
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| scobay [ 05 фев 2019, 13:47 ] | |
| Заголовок сообщения: | Re: hp 15-ay167sa (la-d707p rev:1) no 3.3v/5v ld03/ld05 |
Thanks will check out, can you tell me the name of the schematic that is from. |
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| siberian [ 05 фев 2019, 14:38 ] | |
| Заголовок сообщения: | Re: hp 15-ay167sa (la-d707p rev:1) no 3.3v/5v ld03/ld05 |
if ENLDO = 4.7V, then you need to measure the resistance at the outputs of the LDO |
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| scobay [ 05 фев 2019, 16:22 ] | |
| Заголовок сообщения: | Re: hp 15-ay167sa (la-d707p rev:1) no 3.3v/5v ld03/ld05 |
siberian писал(а): if ENLDO = 4.7V, then you need to measure the resistance at the outputs of the LDO Hi pin 14 = 15 ohm pin 15 = 30 ohm 4.7v on pin 12 wold be correct due to resistor divider. |
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| armagon [ 05 фев 2019, 20:09 ] | |
| Заголовок сообщения: | Re: hp 15-ay167sa (la-d707p rev:1) no 3.3v/5v ld03/ld05 |
Compal NM-A181 shematic |
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| siberian [ 06 фев 2019, 11:09 ] | |
| Заголовок сообщения: | Re: hp 15-ay167sa (la-d707p rev:1) no 3.3v/5v ld03/ld05 |
scobay писал(а): Hi pin 14 = 15 ohm pin 15 = 30 ohm I hope you take measurements with a completely de-energized board? If so, then take off RT8243 and try again... |
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| scobay [ 06 фев 2019, 15:29 ] | |
| Заголовок сообщения: | Re: hp 15-ay167sa (la-d707p rev:1) no 3.3v/5v ld03/ld05 |
Yes that measurement is with RT8234 removed . |
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| siberian [ 06 фев 2019, 18:45 ] | |
| Заголовок сообщения: | Re: hp 15-ay167sa (la-d707p rev:1) no 3.3v/5v ld03/ld05 |
then apply for the LDO bus, respectively, 3.3 and 5.0 volts from the laboratory source and see what is heating up |
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